A hidden self-portrait has been discovered by X-ray on the back of a Van Gogh painting

A hidden, never before discovered Vincent Van Gogh self-portrait has been found on the back of one of the famed artist's paintings. An X-ray revealed the secret portrait on the back of Van Gogh's "Head of a Peasant Woman."

The 1885 painting was being examined ahead of an upcoming exhibition at the Royal Scottish Academy in Edinburgh, Scotland. 

The National Galleries of Scotland (NGS) discovered the back of the canvas was covered in layers of glue and cardboard.